*.positioned{
    position: relative;
}

div{
    border: 1px;
    width: 500px;
    height: 500px;
    background-color: red;
}

*.absolute{
    position: absolute;
    top: 100px;
    left: 100px;

}

*.div01{
    background: aqua;
    width: 100px;
    height: 100px;
}

*.div02{
    background: blueviolet;
    width: 400px;
    height: 400px;
}

